// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CC_TILES_TILE_TASK_MANAGER_H_
#define CC_TILES_TILE_TASK_MANAGER_H_

#include <stddef.h>

#include "cc/raster/raster_buffer_provider.h"
#include "cc/raster/task_graph_runner.h"
#include "cc/raster/tile_task.h"

namespace cc {
// This interface provides the wrapper over TaskGraphRunner for scheduling and
// collecting tasks. The client can call CheckForCompletedTasks() at any time to
// process all completed tasks at the moment that have finished running or
// cancelled.
class CC_EXPORT TileTaskManager {
public:
    TileTaskManager();
    virtual ~TileTaskManager();

    // Schedule running of tile tasks in |graph| and all dependencies.
    // Previously scheduled tasks that are not in |graph| will be canceled unless
    // already running. Once scheduled and if not canceled by next scheduling,
    // tasks are guaranteed to run.
    virtual void ScheduleTasks(TaskGraph* graph) = 0;

    // Check for completed tasks and call OnTaskCompleted() on them.
    virtual void CheckForCompletedTasks() = 0;

    // Shutdown after canceling all previously scheduled tasks.
    virtual void Shutdown() = 0;
};

class CC_EXPORT TileTaskManagerImpl : public TileTaskManager {
public:
    ~TileTaskManagerImpl() override;

    static std::unique_ptr<TileTaskManagerImpl> Create(
        TaskGraphRunner* task_graph_runner);

    // Overridden from TileTaskManager:
    void ScheduleTasks(TaskGraph* graph) override;
    void CheckForCompletedTasks() override;
    void Shutdown() override;

protected:
    explicit TileTaskManagerImpl(TaskGraphRunner* task_graph_runner);

    TaskGraphRunner* task_graph_runner_;
    const NamespaceToken namespace_token_;

private:
    DISALLOW_COPY_AND_ASSIGN(TileTaskManagerImpl);
};

} // namespace cc

#endif // CC_TILES_TILE_TASK_MANAGER_H_
